Combination bolster and punch press



Jan. 21, 1941. c. BARBIERI 2,229,488

GQMBINA'I'ION BOLSTER AN!) PUNGH PRESS Fi1ed Nov. 27, 1959 2Lsmm' smn 1SEE-2 ZZYVEHZUF Cesare Barier] Patentecl Jan. 21, 1941 UNITED STATESPATENT OFFICE Cesa1'e 'Barbieri, New York, N. Y. assignor toDixie-Vortex C'ompany, Chicago, Ill. a corporation cf Delaware 1Applicatiohll'ovember 27, was, Serial N0. 306,311

3 Claims.

This invention relates to a combination bolster and punch press foreconomically blanking comparatively thin material and adaptedparticularly for punching 1arge size blanke of flexible mate rial.

Heretofore in the blanking of comparatively 'light material such a-ssheet metal, paper or the like, die sets, comprising bolster and punchholder elements, have been employed and these die sets Were mounted andsecured on the beds of Standard punch presses anal with the punch holderadapted for securing to the reciprocating punch head for operation cfthe die Set. Such procedure involves the expense of costly standardpu'nch presses and the operation thereof, particularly where thematerial 110 be blanked is comparatively thin end requires very littlepower for cutting or punching thereof.

An important object of my invention is to elim- 20 inate the necessityfor the use of a standard expensive type of punch press in the blankingof material when comparatively little power is required for the punchingoperation, and thereby materially reduce the cost of equipment and 25operation.

In aceordance with my invention, I have produced a combination orunitary structure comprising a bolster element for supporting a die shoeor plate, and a punch holder element guided 30 relative to the bolsterelement and operated or reciprocated by driving means mounted o-n endsupported by the bolster structure. In other words, my improvedstructure may be considered as a die supporting bolster structure With35 a punch press mounted thereon to form a. unitary assembly orstructure therewith. Such unitary structure may be readily driven as byan electric motor of a capacity commensurate with the power necessa.ryfor the punching or blank- 40 ing operation by the unitary structure.

My improved structure is fully disclosed on the accompanying drawings inwhich:

Figure 1 is a. plan view;

Figure 2 is a side elevation;

45 Figure 3 is an end elevation;

Figure 4 is a section on plane IV--IV Figure 1; anti Figure5 is asection on plane VV Figure 1.

The structure disclosed comprises the bolster 50 element B and the punchpress element P. The bolster element comprises the base plate I0 onwhich ma.y be detachably secured a die shoe or plate II 120 span theblank discharge passageway I2 through the bolster base, the die platebeing 55 cut out to the size and shaped corresponding with the blank tobe punched, the cutout I3 of the die platze shown beillg rectangular.

The punch press element comprises the punch holder I4, shown in the formof a. rectangular plate having upstanding bosses I5 at its corners 5which are bored. to receive the leader or guide pins I6 secured to andextending upwardly from the bolster element base II]. The punch holdersupports the punch or die member Il which is detachably secured againstits under face, the 10 punch being shown in the form of a rectangular.plate for entering the rectangular cutout I3 for cuttingcorr-espondingly shaped blanke from the material fed between the diepla.te end punch as the punch holder is vertically reciprocated on theleader pins.

Preferably integral With the bolster base III and at I;he ends thereofare bearing pedestals I8 and I9 terminating in journal boxes and 2I forjournaling a shaft 22. This shaft ha-s 20 eccentric or crank portions 23for receiving crank rods 24 which a.t their lower ends receive pins 25supported in ea.rs 26 extending upwardly from the punch holder plate I4.Two crank rods are shown engaging with the opposite ends of the 25 punchholder, end upon rotation of the shaft 22 the punch holder will bereciprocated on the leader or guide pins I6 for repeatedly engaging thepunch I1 in the die plate cutout I3 for blanking the material fedthrough the structure. The punchholder plate I4 has the recesses 21 abits ends for receiving and clearing the bearing pedestals for the shaft22.

In the driving arrangement shown Tor the shaft 22, a, gear 28 is mountedon one end of the shaft and a flyviheel 28 is preferably mounted on Eheother end so as to balance the Weight of the gear and hold the shaft 22balanced in its bearings. An ofiset boss 29 on the outer side of ehebearing pedestals I8 supports a stud shaft 30 for a transmission gear 3Iand pinion 32 assembly, the pinion meshing with the gear 28 on the shaft22 and the gear 3I being meshed by the drive pinion 33 on the armatureshaft 34 of a driving source such as an electric motor 35. The gearingtrain suitably reduces the motor speed for the desired speed of thepunch operating shaft 22.

Adjustably mounted 011 the shaft 22, as by means cf setscrews 36, arethe hubs 31 of stripper cams 38. Two such ca m structures are shownarranged adjacent 120 and inwardly of the crank rods 24. These camscooperate with -the stems 39 of stripper heads 40, these heads beingcircular end normally engaging in circular passageways 4I through -thepunch I1, the stems extending through tzhe guide passageways 42 in thepunch holder plate I4. Springe 43 encircle the stems betzween tzhe punchholder platze and oollars 44 an the stems and tend to hold the ends ofthe stems againstz -the cam surfiaces cf the carns 38. The camperipheries are shown as being circular butz eccentzric relative to tzheshaftz 22, and atz the pointz fartzherestz distantz from the shaftz axiseach cam has an abrupt extension or bootzh 45.

Normally tzhe punch holder is in 'itzs 1ipper positzin as shown 011 tzhedrawings. When ehe shaftz 22 is turned, tzhe crank rod connection willcause tzhe punch holder tzo be shiftzed downwardly on tzhe pins I6 tzoforce the punch IT through the stzock tzo be blanked, and a distanceintzo tzhe cutoutz I3 of tzhe die plate. The setztzing of tzhe stzrippercams relative to tzhe crank shaftz parts 23 is such thatz as tzhe punchholder moves downwardly the cams will shiftz tzhe stems 39 and stzripperheads 40 downwardly in tzhe passageways 4l in tzhe punch so tzhat, tzhestzrlpper heads Will hold tzhe stock during blanking tzhereof, andduring tzhe final movementz of the cams, their teetzh 45 Will eflectzquick final downward shift; of tzhe stzrlpper heads tzo foree throughtzhe die platze cutoutz I3 and intz0 tzhe discharge passage I2 tzheblank Which has been punched from tzhe stock. During tzhe second halfrotation of the shaft; 22, tzhe strippers Will be retzurned tzo thenormal positzi0n by tzhe springs 43 as tzhe punch holder is raised backtzo normal position. Thus as the structzure operatzes, tzhereciprocatzing punch holder punches the blanks from tzhe stzool and tzhestrippers discharge the blanks into the discharge pass'ageway I2, andthe blanke may be received oh suitzable conveyor means (notz shown) Thusby combining a die supportzing bolstzer structure and punch pressstructzure into a unitary assembly, blanking, partzicularly ofcomparatzively light stock, can -be more economically and efiicientzlyaccomplished and tzhe necessi-tzy for tzhe use of standard expensivetype punch presses is eliminatzed. In my improved combination structure,tzhe die and punch elementzs are detzachably applied and tzhe die andpunch elementzs for any desired shape of blanke can be quickly andreadily mountzed in position.

I have shown a practzical and efilcient emloodimentz of my inventzionbutz I do not;-desire tzo be limitzed tzo tzhe exactz constzructzion andarrangement; shown and described as changes and modificatzions may bemade witzhoutz departzing from the scope of tzhe inventzion.

I claim as follows:

1. A punching assembly for punching lightzweight; material such as paperand the like, said assembly comprising a rectang*ular base platzeprovided witzh an upstanding stzub pin atz each of its four corners, adie plate seatzed on said bas platze, a rectzangular punch holder platzeprovided witzh upstanding and outzstanding bosses on each of it's fourc0rners, said stub plus being entered in said bosses for guided slidingmovement of said holder platze on said plus, a die on said holder plate,a -pair of upstanding bearing pedes'oals on said base platze, one atzeach of opposite ends of said base platte and witzh each disposedbetzween a pair of bosses and in spaced relation tzo said holder platze,a revolvable shaftz journaled in said bearing pedestzals and disposedabove said holder plante, means depen-dirrg firom said shaftz andpivotzally connectzed. tzo said shaftz and to said holder platze, andstripper means operably connectzed witzh said shaft and movable in saiddie holder platze.

2. A punching assembly for punching lightzweightz material such as paperand tzhe like, said assembly comprising a rec-tzangular base plateprovided with an upstzanding stzub pin at each of its four corners, adie plate seatzed on said base platze, a rectzangular punch holderplatze provided witzh upstanding and outzstzanding bosses on each of itsfour corners said stzub pins being entered in said bosses for guidedsliding movementz of said holder platze on said pins, a die 011 saidholder platze, a pair of upstzanding bearing pedestzals on said baseplatze, one atz each of oppositze ends of said base plate and Witzh eachdisposed betzween a pair of bosses and in spaced relation tzo saidholder platze, a revolvable shaftz journaled in said bearing pedestzalsand disposed aloove said holder platze, link means depending from saidshaftz and pivotzally connectzed to said shaft; and tzo said holderplatze, a stzripper rod resilien-tzly supported on said holder platzefor movementz therein, and a cam on said shaftz operably conneeted witzhsaid stripper rod tzo intermitztzentzly depress said rod.

3. A punohing assembly for pl.lnching lightzweightz material such aspaper and tzhe like, said assembly oomprising a base platze providedwitzh upstzanding stub pin means, a die platze seated on said baseplate, a punch holder platze provided 1 Witzh vertically extendingbosses, said stzub pin means being entered in said bosses for guidedsliding movement of said holder plate on said pin means, a die on saidholder platze, upstzanding bearing pedestzal means on said base platzedisposed betzween spaced bosses and in spaced relatzion tzo said holderplatze, a revolvable shaftz journaled in said bearing pedestzal meansand disposed above said holder platze, and means depending from saidshaftz and connectzed to said shaftz and tzo said holder platze formoving said holder plate up and down in itzs punching stzr0ke.

CESARE BARBIERI.

